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Thread: 8.1L PCM Controlling 1991 to 93 4L80E

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    Member 1BadAction's Avatar
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    Default 8.1L PCM Controlling 1991 to 93 4L80E

    Is this possible? In other words, if I take an 8.1L power plant with it's PCM and swap it into an older 3/4 ton Suburban that originally came with a 4L80E, can that 8.1L PCM control the older 4L80E? Or will I need to swap something out in the transmission?


    2013 1SS/1LE Blue Ray Metallic Camaro - DD
    1991 2500 Suburban - Roller cam'd high compression 454ci BBC tow monster
    1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
    1984 18' Contender Tunnel/2.4 Merc ModVP

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    It depends. If the 8.1L had a 4L80E behind, obviously yes. If the PCM had an Allison, but has the same OS number as a tune that had a 4L80E, then yes, do a segment swap. Also, if the 4L80E has the original style (91-92) internal harness, it will need to be updated. If its an 04+ PCM, will probably need an 04+ force motor in the 4L80E.

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    Member 1BadAction's Avatar
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    Excellent, IF I do what I'm thinking, I want to make sure I start with the easiest engine/pcm to use. Sounds like up to an 03 is the way to go.

    I'm not sure if the harness has been done, but from what I understand it's a fairly simple procedure. Project TowBeast full steam ahead! lol


    2013 1SS/1LE Blue Ray Metallic Camaro - DD
    1991 2500 Suburban - Roller cam'd high compression 454ci BBC tow monster
    1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
    1984 18' Contender Tunnel/2.4 Merc ModVP

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